#define MSTATUS_MPRV 0x00020000
#define MSTATUS_PUM 0x00040000
#define MSTATUS_MXR 0x00080000
+#define MSTATUS_TVM 0x00100000
+#define MSTATUS_TW 0x00200000
+#define MSTATUS_TSR 0x00400000
#define MSTATUS32_SD 0x80000000
#define MSTATUS64_SD 0x8000000000000000